Method of making pipe joints



Oct. 2, 1934. w. H. ARMACOST 1,975,495

METHOD OF MAKING PIPE JOINTS Filed Jan. 17, 1935 2 Sheets-Sheet l INVENTOR ATTORNEY Oct. 2, 1934. w. H. ARMACOST 1,975,495

METHOD OF MAKING PIPE JOINTS Filed Jan. 17, 1935 2 Sheets-Sheet 2 6 ll H F3 not ."L 2

-- Z I l i i A? Iii INVENTOR ATTORNEY Patented Oct. 2, 1934 1,975,495

UNITED STATES PATENT OFFICE 1,975,495 METHOD OF MAKING PIPE JOINTS Wilbur n. Armaeost, New mi, N. Y., assignor to The Superheater Company, New York,

N. Y. Application January 1'7, 1933, Serial No. 652,201 1 Claim. (Cl. 29-148) The present invention relates to a process for 6 will if necessary take up any stresses. In order joining pipes by means of autogenous welding to keep the sleeve in place and not permit its and has for its purpose the provision of an imcareless removal it is preferably welded at one proved method of this kind. or two points to one of the pipes as indicated The present application is a division of United, at 12. 60 States application 435,201 filed March 12, 1930, It will be understood that the amount to which as far as the forms shown in Figs. 1 to 9 are the pipes have to be upset does not need to be concerned. The form of Fig. 10 is additional very great. There must be provided merely matter. enough thickness so that the threads 5 and 11 do 10 The art of autogenous welding has been so far not weaken the pipe ends below the strength of 55 developed by this time that perfectly satisfactory the pipes themselves. joints of pipes can be made, but no satisfactory In some instances instead of upsetting the method has yet been suggested for testing joints pipes, a belling out, as indicated in Fig. 5 will be after they have been made so that it is never entirely satisfactory. The belling out is carried 15 certain whether the welder has done his work only to such an extent that the threaded sleeve 70 thoroughly or not. Joints of this type would un- 6 can be screwed back on to the pipes. doubtedly come into more general use if amethod In some instances it will be entirely satis could be devised for testing the joint, or if some factory to thread the ends of the pipes without other way could be devised for assuring the user any previous upsetting. This is illustrated in of the safety of the joint. The latter is what my Fig. 10 which shows the joint completed and the 15 invention is intended to do. sleeve in place. It will be noted that the thread 1'. illustrate my invention on the accompanying on the pipe onto which the sleeve is first screwed two sheets of drawings in which Figs. 1, 2 and 3 must be carried back far enough, asto the point A, illustrate successive steps in the process, the pipes to permit the sleeve being screwed on far enough being shown either entirely or partly in longito clear the end of the pipe. The thread on the tudinal section, and Fig. 4 shows the completed other pipe as well as on the welded material is product. Fig. 5 shows the completed joint emout, 'just as described in connection with Figs. bodying a variation, and Figs. 6, 7 and 8 illus- 1 to 4, after the weld has been made. trate steps in reassembling the joint after it has Provision must be made in' some instances for 30 been broken. Figs. 9 and.10 show variations of breaking and remaking such a pipe joint. If the the invention. sleeve is screwed ofl. and the welding material Referring first to Fig. 1, the two pipes to be removed, thereby separating the pipes, it would joined are shown at 1 and 2, their ends are prefordinarily be very difficult to get them back into erably upset or thickened as at 3 and 4, the inthe original relative position for the purpose of 35 terior diameter being kept unaltered. A machine rewelding them, and unless they were replaced in 9 thread 5 is out on one upset end. A oorrespondthe original relative position the sleeve could not ingly threaded sleeve 6 is screwed on the threadbe screwed into place. I provide for such breaked end 3 or slipped on the pipe from the opposite ing and remaking of the joint by forming the end of the pipe if this is accessible. The two sleeve 6with an aperture indicated at 13. Its use 4 pipes 1 and 2 are then brought into the relative is as follows: When the pipes have been sepapositions they are to occupy with their scarfed rated and are to be reconnected, the material that ends 7 and 8 in juxtaposition. The upset end 4, was originally added in making the first joint is it will be noted, is unthreaded at this stage. The removed so that the pipes are again beveled at two pipes are held in the position indicated and their ends. They are then placed into the a welded as at 9, Fig. 2, in the ordinary way, the original relative position and the sleeve 6 screwed 10 added material for the weld being built up so as into place. At three or four points on the circumto extend at least as high all around as the ference the two are then spot welded together upset ends 3 and 4. A split die is next put in place as at 14, Figs. 6 and '7. The sleeve is then screwed on the thread 5, and a thread is out on the ma-' back out of place, the two pipes being held in their 919 terial 9 and the upset end 4, as indicated at 10 relative positions by the spot welding. After this and 11 in Fig. 3. The die is then removed and. the weld is completed in the ordinary way. The the sleeve 6 screwed into place as indicated in material added may be built up beyond the con- Fig. 4. tour of the pipes just as in the original weld, in

This completed pipe joint depends primarily which case a split die has to again be used to .9 for its strengthupon the weld 9 but the sleeve cut a new thread in this material; or the mano terial is not built up quite as high so that it is unnecessary to cut such a thread. The latter idea is illustrated in Fig. 8 where it will be noted the material 15 does not quite fill the V shaped space between the two pipe ends.

After the weld is finished the sleeve is screwed into place and tack welded in position as at 12.

It will be clear that some variations may be made in practicing my invention, without departing from its spirit.

It is not necessary that the connection between the sleeve and the pipes be effected by threading one on the other. Different means may be used, as illustrated in Fig. 9, where the sleeve 6 is secured to the pipes 1 and 2 by means of the dowels 16. The manner in which the assembly is made is obvious. If desired, the ends of the pipes may be upset in which case the number of dowels required will be less. The dowels are distributed around the sleeve and may or may not extend through the pipes. If they do, their outer ends should be sealed up by welding.

This form shares some of'the advantagesof the form first described but it is more difiicult to take down and reassemble the joint. To do this, the dowels have to be drilled out, and temporary dowels inserted for tacking together the pipes preparatory to welding them together. The temporary dowels are then withdrawn, the sleeve pushed out of the way, the welding performed, the sleeve replaced, and the permanent dowels inserted.

What I claim is:

The method of joining two pipes having screw threaded ends, there being a threaded sleeve with a lateral aperture over one pipe far enough in from the end to be free from the threads thereon, which comprises the steps of placing the pipes in the relative position they are to occupy when together through the aperture sufliciently to hold them temporarily, screwing the sleeve out of the way, completing the welding, and screwing the sleeve back into place.

WILBUR H. ARMACOST. 

